JP2006226668A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger having excellent heat exchange performance, especially when used as an evaporator. <P>SOLUTION: This heat exchanger 1 is has a heat exchange core 4, a coolant inlet header 5 and a coolant outlet header 6 arranged on the upper end side of a heat exchange tube 12, and a coolant inflow side intermediate header 9 and a coolant outflow side intermediate header 11 arranged on the lower end side of the heat exchange tube 12. A flow dividing control wall 67c having a plurality of coolant passage holes 71 for dividing the inside of the second intermediate header 11 into two spaces 11A, 11B in the height direction is formed in the second intermediate header 11. The first intermediate header 9 is communicated made to communicate at one end with the lower space 11B of the second intermediate header 11. A guide part 80 for guiding the coolant entering the lower space 11B of the second intermediate header 11 to the flow dividing control wall 67c side, namely, to the upper side, is formed at the coolant inflow side end of the second intermediate header 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger suitably used as an evaporator of a car air conditioner that is a refrigeration cycle mounted on an automobile, for example.

  In this specification and claims, the downstream side in the ventilation direction (the side indicated by the arrow X in FIGS. 1 and 11 and the right side in FIG. 3) is the front, and the opposite side is the rear. In addition, the top and bottom in FIG.

  Conventionally, as an evaporator for a car air conditioner, a plurality of flat hollow bodies formed by brazing peripheral edges with a pair of plate-shaped plates facing each other are arranged in parallel, and corrugated fins are arranged between adjacent flat hollow bodies. So-called laminated evaporators brazed to a flat hollow body have been widely used.

  Incidentally, in recent years, there has been a demand for further reduction in size and weight and higher performance of the evaporator. And as an evaporator satisfying such a requirement, a heat exchange core section constituted by arranging two rows of heat exchange pipes arranged in the front-rear direction, each of which is composed of a plurality of heat exchange pipes arranged at intervals, A refrigerant inlet header portion arranged on the upper end side of the heat exchange pipe and connected to the left half heat exchange pipe of the front heat exchange pipe group, and on the rear side of the refrigerant inlet header section on the upper end side of the heat exchange pipe A refrigerant outlet header portion arranged and connected to the heat exchange pipe in the left half of the rear heat exchange pipe group, and a heat exchange arranged on the lower end side of the heat exchange pipe and connected to the refrigerant inlet header portion A first intermediate header portion to which the heat exchange pipe of the tube group is connected, and a second intermediate header portion that is arranged on the right side of the first intermediate header portion and to which the remaining heat exchange tubes of the front heat exchange pipe group are connected. The upper end side of the heat exchange pipe is disposed on the right side of the refrigerant inlet header. And the 3rd middle header part to which the heat exchange pipe connected to the 2nd middle header part was connected, and the rear side heat exchange pipe arranged at the back of the 3rd middle header part in the upper end side of a heat exchange pipe A fourth intermediate header portion to which the remaining heat exchange pipes of the group are connected, and a heat exchange disposed on the rear side of the second intermediate header section on the lower end side of the heat exchange pipe and connected to the fourth intermediate header section A fifth intermediate header portion to which the pipe is connected, and a sixth intermediate portion to which the heat exchange pipe connected to the refrigerant outlet header portion is disposed on the left side of the fifth intermediate header portion on the lower end side of the heat exchange pipe A header portion, and the refrigerant flowing into the refrigerant inlet header portion flows into the refrigerant outlet header portion through the first to sixth intermediate header portions through the heat exchange pipe, and flows out from the refrigerant outlet header portion. (See Patent Document 1) .

  In the evaporator described in Patent Document 1, the first intermediate header portion and the second intermediate header portion, and the fifth intermediate header portion and the sixth intermediate header portion are each integrally provided in one header. The refrigerant flows into the header portion and the sixth intermediate header portion from one end portion in the length direction.

However, in the evaporator described in Patent Document 1, the refrigerant that has flowed into the second intermediate header portion and the sixth intermediate header portion is likely to flow backward in both intermediate header portions, so the refrigerant inflow side of both intermediate header portions It is difficult to flow into the heat exchange pipes, and as a result, it is difficult to uniformly divert to all the heat exchange pipes connected to the intermediate header portions. Therefore, there is a problem that the distribution of the refrigerant is uneven in the heat exchange core part, and the temperature of the air that has passed through the heat exchange core part becomes uneven depending on the location, so that the heat exchange performance is not sufficiently improved.
JP 2003-214794 A

  An object of the present invention is to solve the above problems and provide a heat exchanger having excellent heat exchange performance.

  In order to solve the above-mentioned problems, the present invention comprises the following aspects.

1) It has a refrigerant inlet header section and a refrigerant outlet header section arranged side by side in the front-rear direction, and a refrigerant circulation path that passes through both header sections, and the refrigerant circulation path has a plurality of intermediate header sections and a plurality of heat exchanges. A refrigerant inlet header portion and one intermediate header portion are opposed to each other, and the refrigerant outlet header portion and the other intermediate header portion are opposed to each other. And between the refrigerant outlet header part and the intermediate header part, at least one row of heat exchange pipe groups composed of a plurality of heat exchange pipes arranged at intervals is arranged. Both ends of the heat exchange pipe to be configured are connected to header sections facing each other, and the refrigerant that has flowed into the refrigerant inlet header section returns to the refrigerant outlet header section through the refrigerant circulation path, and the refrigerant outlet header section Together they are adapted to be fed, in at least one of the intermediate header section, a heat exchanger refrigerant is adapted to flow from one end of its length,
A heat exchanger in which a guide portion that guides the refrigerant flowing into the intermediate header portion upward is provided at an end portion of the refrigerant inflow side in the intermediate header portion into which the refrigerant flows from one end portion in the lengthwise direction.

  2) A heat exchange core group configured by arranging a plurality of heat exchange tube groups, each of which is composed of a plurality of heat exchange tubes arranged at intervals, arranged in the front-rear direction, and disposed on one end side of the heat exchange tube And a refrigerant inlet header portion to which heat exchange pipes of at least one row of heat exchange pipe groups are connected, and one end side of the heat exchange pipes arranged behind the refrigerant inlet header section, and the remaining heat exchange pipe groups A refrigerant outlet header part to which the heat exchange pipe is connected, a first intermediate header part arranged on the other end side of the heat exchange pipe and connected to the refrigerant inlet header part, and a heat A second intermediate header portion disposed on the rear side of the first intermediate header portion on the other end side of the exchange pipe and connected to a heat exchange pipe connected to the refrigerant outlet header portion. The header portion and the second intermediate header portion are communicated at one end, and the second middle The refrigerant flows into the header portion from the end portion on the communication side with the first intermediate header portion, and the refrigerant flowing into the second intermediate header portion is guided upward to the refrigerant inflow side end portion of the second intermediate header portion. The heat exchanger according to 1) above, wherein a guide portion is provided.

  3) In the second intermediate header portion, there is provided a flow dividing control means that has a refrigerant passage hole and divides the inside of the second intermediate header portion into two spaces in the height direction, and is connected to the second intermediate header portion. The heat exchange pipe faces the first space, and the first intermediate header portion and the second space of the second intermediate header portion are communicated at one end portion, and are provided at the refrigerant inflow side end portion in the second intermediate header portion. The heat exchanger according to 2) above, wherein the guide portion guided guides the refrigerant flowing into the second space of the second intermediate header portion upward.

  4) The heat exchanger according to 3) above, wherein a plurality of refrigerant passage holes are formed in the diversion control means at intervals in the length direction of the second intermediate header portion.

  5) The heat exchanger according to 3) or 4), wherein the refrigerant passage hole is formed on the rear side of the center part in the front-rear direction of the flow dividing control means.

  6) Among the above 2) to 5), the refrigerant inlet header part and the refrigerant outlet header part are arranged on the upper end side of the heat exchange pipe, and the first and second intermediate header parts are arranged on the lower end side of the heat exchange pipe The heat exchanger in any one of.

  7) Each of the first and second intermediate header portions has a cap that closes both end openings, and a refrigerant outlet is formed in the cap at one end portion of the first intermediate header portion, and the second intermediate header portion The refrigerant inlet is formed in the cap at one end of the two, and the refrigerant outlet and the refrigerant inlet are communicated with each other through the communication member, whereby the intermediate header portions are communicated at one end. ).

  8) The above described 7), wherein a guide portion that is inclined or curved upward toward the inside of the second intermediate header portion is provided in a part of the peripheral edge portion of the refrigerant inlet in the cap at one end portion of the second intermediate header portion. Heat exchanger.

  9) The guide portion is curved upward toward the inside of the second intermediate header portion, and the guide portion is located in the second intermediate header portion in a cross section cut by a vertical plane extending in the length direction of the second intermediate header portion. The heat exchanger as described in 8) above, wherein the heat exchanger has an arcuate portion curved upward toward the direction.

  10) The cap formed with the refrigerant inlet in the first intermediate header and the cap formed with the refrigerant outlet in the second intermediate header are integrated, and the communication member is fixed so as to straddle both caps. The heat exchanger according to any one of 7) to 9) above.

  11) The heat exchanger according to any one of 2) to 10) above, wherein the first intermediate header portion and the second intermediate header portion are integrated.

  12) The first and second intermediate header portions form the heat exchange tube side portion of both intermediate header portions, and the first member to which the heat exchange tubes are connected, and the heat exchange tubes of both intermediate header portions are opposite The heat exchanger according to 11), further comprising a second member that forms a side portion and is joined to the first member, whereby both intermediate header portions are integrated.

  13) The heat exchanger according to any one of 2) to 12) above, wherein the refrigerant inlet header and the refrigerant outlet header are integrated.

  14) The refrigerant inlet header part and the refrigerant outlet header part form a part on the heat exchange pipe side of both header parts and the heat exchange pipe is connected to the first member and the opposite side of the heat exchange pipes of both header parts The heat exchanger according to 13), further comprising a second member that forms a portion and is joined to the first member, whereby both header portions are integrated.

  15) The refrigerant inlet is formed at one end of the refrigerant inlet header, and the refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header. Heat exchanger.

  16) The refrigerant outlet header is partitioned into two spaces in the height direction by the dividing means, and a heat exchange pipe is connected so as to face the first space, and a refrigerant passage hole is formed in the dividing means. The heat exchanger according to 15) above, wherein the second space of the header portion leads to the refrigerant outlet.

  17) The above-mentioned 1) to 1), wherein the heat exchange tube is flat and is arranged with its width direction facing the front-rear direction, and the tube height, which is the thickness of the heat exchange tube, is 0.75 to 1.5 mm. The heat exchanger according to any one of 16).

  18) Fins are arranged between adjacent heat exchange tubes, and the fins have a corrugated shape including a wave crest part, a wave bottom part, and a flat connection part that connects the wave crest part and the wave bottom part, and the fin height is The heat exchanger according to any one of 1) to 17) above, which has 7.0 mm to 10.0 mm and a fin pitch of 1.3 to 1.7 mm.

  19) The corrugated fin has a wave crest and a wave bottom formed of a flat portion and a rounded portion provided on both sides of the flat portion and connected to the connecting portion, and the curvature radius of the rounded portion is 0.7 mm or less. 18) The heat exchanger described.

  20) A refrigeration cycle comprising a compressor, a refrigerant cooler, and an evaporator, wherein the evaporator comprises the heat exchanger according to any one of 1) to 19) above.

  21) A vehicle on which the refrigeration cycle described in 20) above is mounted as an air conditioner.

  According to the heat exchanger of 1), a guide portion for guiding the refrigerant flowing into the intermediate header portion to the upper side is provided at the refrigerant inflow side end portion of the intermediate header portion into which the refrigerant flows from one end portion in the length direction. The following effects are achieved. That is, when the intermediate header portion is arranged on the lower side, the refrigerant flowing into the intermediate header portion is guided to the heat exchange pipe side by the guide portion, and the refrigerant flows into the intermediate header portion. It is easy to flow into the heat exchange pipe connected to the portion on the side, and it is easy to evenly flow into the heat exchange pipe connected to the intermediate header portion. Further, when the intermediate header portion is arranged on the upper side, the refrigerant flowing into the intermediate header portion is guided upward by the guide portion, and from the refrigerant inflow side end portion of the intermediate header portion. It becomes easy to flow into the heat exchange pipe at a distant position, and it becomes easy to evenly divide into the heat exchange pipe connected to the intermediate header portion. Therefore, in any case, the distribution of the refrigerant in the heat exchange core part is less likely to be biased, the temperature of the air that has passed through the heat exchange core part is also uniformed, and the heat exchange performance is improved.

  According to the heat exchanger of 2), the guide portion that guides the refrigerant flowing into the second intermediate header portion upward is provided at the refrigerant inflow side end portion of the second intermediate header portion. Has an effect. That is, when the second intermediate header portion is arranged on the lower side, the refrigerant flowing into the second intermediate header portion is guided to the heat exchange pipe side by the guide portion, and the second intermediate header portion It becomes easy to flow also into the heat exchange pipe connected to the refrigerant inflow side portion, and it becomes easy to evenly divert to the heat exchange pipe connected to the second intermediate header portion. Further, when the second intermediate header portion is arranged on the upper side, the refrigerant flowing into the second intermediate header portion is guided upward by the guide portion, and the refrigerant inflow side of the second intermediate header portion It becomes easy to flow into the heat exchange pipe at a position far from the end portion, and it becomes easy to evenly divert to the heat exchange pipe connected to the second intermediate header portion. Therefore, in any case, the distribution of the refrigerant in the heat exchange core part is less likely to be biased, the temperature of the air that has passed through the heat exchange core part is also uniformed, and the heat exchange performance is improved.

  According to the heat exchangers of 3) to 5) above, when the second intermediate header portion is disposed on the lower side, the refrigerant flowing into the second space of the second intermediate header portion is guided by the guide portion. Is guided to the flow dividing control means side, flows through the refrigerant passage hole into the first space, and then flows into the heat exchange pipe. Further, when the second intermediate header portion is arranged on the upper side, the refrigerant that has flowed into the second space of the second intermediate header portion is guided upward by the guide portion, and the refrigerant passage hole of the diversion control means And then flows into the first space and then flows into the heat exchange pipe. Therefore, in any case, if the refrigerant passage hole of the flow dividing control means is formed at a suitable position for achieving uniform flow distribution to the heat exchange pipe connected to the second intermediate header portion, the refrigerant Can easily be diverted uniformly to the heat exchange pipe connected to the second intermediate header. As a result, the distribution of the refrigerant in the heat exchange core part is less likely to be biased, the temperature of the air that has passed through the heat exchange core part is made uniform, and the heat exchange performance is improved.

  According to the heat exchanger of 6), the refrigerant that has flowed into the second space of the second intermediate header portion is guided to the diversion control means side by the guide portion, passes through the refrigerant passage hole, and enters the first space. After flowing into the heat exchange pipe. Therefore, if the refrigerant passage hole of the flow dividing control means is formed at a suitable position for achieving a uniform flow distribution to the heat exchange pipe connected to the second intermediate header portion, the refrigerant will be in the second intermediate header portion. It becomes easy to evenly divert to the heat exchange pipe connected to the. As a result, the distribution of the refrigerant in the heat exchange core part is less likely to be biased, the temperature of the air that has passed through the heat exchange core part is made uniform, and the heat exchange performance is improved.

  According to the heat exchanger of the above 7), it can be passed through the first intermediate header part and the second intermediate header with a relatively simple configuration.

  According to the heat exchangers of 8) and 9) above, the guide portion can be formed relatively easily.

  According to the heat exchanger of the above 10), since the caps of both the intermediate header portions are integrated, the number of parts is reduced, and the inside of the first intermediate header portion and the second intermediate header are relatively simple. Can be made through.

  According to the heat exchangers of the above 11) and 12), the total number of parts is reduced.

  According to the heat exchangers of the above 13) and 14), the total number of parts is reduced.

  According to the heat exchangers of the above 17) and 18), it is possible to improve the heat exchange performance while suppressing an increase in ventilation resistance and to improve the balance between the two.

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment described below, the heat exchanger according to the present invention is applied to an evaporator of a car air conditioner using a chlorofluorocarbon refrigerant.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum. In the following description, the left and right in FIG.

  1 to 3 show the overall configuration of the evaporator, and FIGS. 4 to 10 show the configuration of the main part. FIG. 11 shows how the refrigerant flows in the evaporator.

  1 to 3, an evaporator (1) used in a car air conditioner using a chlorofluorocarbon refrigerant includes an aluminum refrigerant inlet / outlet tank (2) and an aluminum refrigerant turn tank that are spaced apart in the vertical direction. (3) and a heat exchange core section (4) provided between both tanks (2) and (3).

  The refrigerant inlet / outlet tank (2) includes a refrigerant inlet header portion (5) located on the front side (downstream side in the ventilation direction) and a refrigerant outlet header portion (6) located on the rear side (upstream side in the ventilation direction). They are connected and integrated with each other by connecting means to be described later. An aluminum refrigerant inlet pipe (7) is connected to the refrigerant inlet header (5) of the refrigerant inlet / outlet tank (2), and an aluminum refrigerant outlet pipe (8) is also connected to the refrigerant outlet header (6). .

  The refrigerant turn tank (3) includes a refrigerant inflow side intermediate header (9) (first intermediate header) located on the front side and a refrigerant outflow side intermediate header (11) (second intermediate header) located on the rear side. The headers (9), (11) are connected and integrated with each other by the connecting part (10), and the headers (9), (11) and the connecting part (10) (20) is formed (see FIG. 3).

  The heat exchange core section (4) is composed of a plurality of heat exchange pipe groups (13) each including a plurality of heat exchange pipes (12) arranged in parallel at intervals in the left-right direction. Are arranged in two rows, the ventilation gap between adjacent heat exchange tubes (12) of each heat exchange tube group (13), and the heat exchange tubes (12) at the left and right ends of each heat exchange tube group (13). Corrugated fins (14) are respectively arranged on the outer sides and brazed to the heat exchange pipe (12). Aluminum side plates (15) are respectively arranged outside the corrugated fins (14) at the left and right ends and brazed to the corrugated fins (14). And the upper and lower ends of the heat exchange pipe (12) of the front heat exchange pipe group (13) are connected to the refrigerant inlet header part (5) and the refrigerant inflow side intermediate header part (9) to become the forward refrigerant circulation part. Yes. The upper and lower ends of the heat exchange pipe (12) of the rear heat exchange pipe group (13) are connected to the refrigerant outlet header part (6) and the refrigerant outflow side intermediate header part (11) to form a return side refrigerant circulation part. Yes.

  As shown in FIGS. 3 and 4, the refrigerant inlet / outlet tank (2) is formed of a plate-shaped first tank formed of an aluminum brazing sheet having a brazing filler metal layer on both sides and connected to all the heat exchange tubes (12). It is formed of a member (16), a second member (17) made of a bare material formed from an extruded aluminum material and covering the upper side of the first member (16), and an aluminum brazing sheet having a brazing material layer on both sides. And the aluminum closure members (18) and (19) which are joined to both ends of the both members (16) and (17) and close both end openings of the hollow body formed by the both members (16) and (17), A long aluminum joint plate (21) is brazed to the outer surface of the closing member (19) so as to straddle the refrigerant inlet header (5) and the refrigerant outlet header (6). A refrigerant inlet pipe (7) and a refrigerant outlet pipe (8) are connected to the joint plate (21).

  The first member (16) has curved portions (22) having a small cross-sectional arc shape with a central portion projecting downward at both front and rear side portions thereof. A plurality of tube insertion holes (23) that are long in the front-rear direction are formed in each bending portion (22) at intervals in the left-right direction. The tube insertion holes (23) of the front and rear curved portions (22) are at the same position in the left-right direction. Standing walls (22a) are integrally formed over the entire length at the front edge of the front curved portion (22) and the rear edge of the rear curved portion (22), respectively. Further, a flat portion (24) constituting a means for connecting the refrigerant inlet header portion (5) and the refrigerant outlet header portion (6) is formed between both curved portions (22) of the first member (16), A plurality of through holes (25) are formed in the flat portion (24) at intervals in the left-right direction.

  The second member (17) has a substantially m-shaped cross section that opens downward, and is provided in the center between the front and rear walls (26) extending in the left-right direction and the front and rear walls (26) and extends in the left-right direction. In addition, a partition wall (27) as a partition means for partitioning the refrigerant inlet / outlet tank (2) into two front and rear spaces, and an upper portion connecting the front and rear walls (26) and the upper ends of the partition wall (27) together. And two substantially arc-shaped connecting walls (28) projecting from each other. The partition wall (27) constitutes means for connecting the refrigerant inlet header part (5) and the refrigerant outlet header part (6). The lower end portion of the rear wall (26) of the second member (17) and the lower end portion of the partition wall (27) are divided resistance plates (29 for dividing the refrigerant outlet header portion (6) vertically) ) Are integrally connected over the entire length. A plurality of refrigerant passage holes (31A) (31B) that are long in the left-right direction are formed in a penetrating manner at intervals in the left-right direction in the portion excluding the left and right end portions in the rear portion of the shunt resistor plate (29). ing. The lower end of the partition wall (27) protrudes downward from the lower ends of the front and rear walls (26), and a plurality of lower walls protrude downward and are fitted into the through holes (25) of the first member (16). The protrusions (27a) are integrally formed with an interval in the left-right direction. The protrusion (27a) is formed by cutting a predetermined portion of the partition wall (27).

  The left closing member (18) is an integrated cap (18a) for closing the left end opening of the refrigerant inlet header (5) and a rear cap (18b) for closing the left end opening of the refrigerant outlet header (6). The front cap (18a) is integrally formed with a right protruding portion (39) fitted into the refrigerant inlet header portion (5), and the rear cap (18b) is integrally formed with the refrigerant outlet header portion. The upper right protrusion (41) fitted into the space (6a) above the shunt resistor plate (29) of (6), and the space (6b) below the shunt resistor plate (29) A lower right projecting portion (42) fitted into the inner portion is integrally formed with a space in the vertical direction. In addition, an engaging claw (43) protruding rightward is integrally formed on the arc-shaped portion between the front and rear side edges and the upper edge of the left closing member (18), and the front part and the rear part of the lower edge are also formed integrally. Engaging claws (44) projecting to the right are integrally formed on the side portions.

  In the right closing member (19), a front cap (19a) for closing the right end opening of the refrigerant inlet header (5) and a rear cap (19b) for closing the right end opening of the refrigerant outlet header (6) are integrated. The front cap (19a) is integrally formed with a left protruding portion (32) that is fitted into the refrigerant inlet header portion (5), and the rear cap (19b) is integrally formed with the refrigerant outlet header portion. The upper left protrusion (33) fitted in the space (6a) above the shunt resistor plate (29) of (6), and the space (6b) below the shunt resistor plate (29) A lower left projecting portion (34) to be fitted therein is integrally formed with an interval in the vertical direction. In addition, an engaging claw (35) projecting leftward is formed integrally with the arc-shaped portion between the front and rear side edges and the upper edge of the right closing member (19), and the front part and the rear part of the lower edge are also formed. Engaging claws (36) protruding leftward are integrally formed on the side portions. A refrigerant inlet (37) is formed in the bottom wall of the left protrusion (32) of the front cap (19a) of the right closing member (19), and the bottom of the upper left protrusion (33) of the rear cap (19b) is also formed. A refrigerant outlet (38) is formed on the wall.

  Both closing members (18) and (19) are plate-shaped, and the upper edges of both closing members (18) and (19) respectively coincide with both ends of the upper surface of the second member (17) of the refrigerant inlet / outlet tank (2). As described above, the shape is such that two substantially arc-shaped portions are integrally connected in the central portion in the front-rear direction. In addition, a flat portion is formed at the center portion in the front-rear direction of the lower edge of the closing members 18 and 19 so as to match the flat portion 24 of the first member 16.

  And the front curved part (22) and flat part (24) of the first member (16), the front wall (26), the partition wall (27) and the front connection wall (28) of the second member (17), A refrigerant inlet header portion (5) is formed by the front caps (18a) and (19a) of the left and right closing members (18) and (19), and the rear curved portion (22) and the flat portion ( 24), the rear wall (26) of the second member (17), the partition wall (27) and the rear connecting wall (28), and the rear caps (18b) (19b) of the left and right closing members (18) (19) ) Forms a refrigerant outlet header portion (6). The refrigerant inlet header part (5) and the refrigerant outlet header part (6) are connected and integrated by a flat part (24), a partition wall (27), and intermediate parts in the front-rear direction of both closing members (18) and (19). ing.

  The joint plate (21) includes a short cylindrical refrigerant inlet (45) leading to the refrigerant inlet (37) of the right closing member (19) and a short cylindrical refrigerant outlet (46) also leading to the refrigerant outlet (38). It has. Bent portions (47) protruding leftward are formed at portions between the refrigerant inlet (45) and the refrigerant outlet (46) at both upper and lower edges of the joint plate (21). The upper bent portion (47) is engaged between the two substantially arc-shaped portions at the upper edge of the right closing member (19) and between the two connecting walls (28) of the second member (17). . The lower bent portion (47) is engaged with the flat portion at the center in the front-rear direction at the lower edge of the right closing member (19) and the flat portion (24) of the first member (16). Furthermore, engaging claws (48) protruding leftward are integrally formed at both front and rear end portions of the lower edge of the joint plate (21). The engaging claw (48) is engaged with the lower edge of the right closing member (19). A reduced diameter portion formed at one end of the refrigerant inlet pipe (7) is inserted into the refrigerant inlet (45) of the joint plate (21) and brazed, and similarly to the refrigerant outlet (46), the refrigerant outlet pipe A reduced diameter portion formed at one end of (8) is inserted and brazed. Although not shown, an expansion valve mounting member is joined to the other ends of the refrigerant inlet pipe (7) and the refrigerant outlet pipe (8) so as to straddle both pipes (7) and (8).

  The first and second members (16), (17), the closing members (18), (19), and the joint plate (21) of the refrigerant inlet / outlet tank (2) are brazed as follows. . That is, the first and second members (16), (17) are inserted into the through holes (25) of the first member (16) by the protrusions (27a) of the second member (17) and caulked. The brazing of the first member (16) with the upper ends of the front and rear rising walls (22a) of the one member (16) engaged with the lower ends of the front and rear walls (26) of the second member (17) They are brazed together using a layer of material. Both the closing members (18), (19) are arranged so that the front protrusions (39), (32) are located in the front space of the partition walls (27) in both members (16), (17), and the rear upper protrusions. (41) (33) in the space behind the partition wall (27) in both members (16) (17) and above the shunting resistance plate (29), and the rear lower protrusion ( 42) and (34) are respectively fitted in the spaces behind the partition wall (27) and below the shunt resistor plate (29), and the upper engaging claws (43) and (35) In a state in which the lower engaging claws (44) and (36) are engaged with the curved portion (22) of the first member (16) while being engaged with the connecting wall (28) of the two members (17). The first and second members (16) and (17) are brazed using the brazing material layer of both the closing members (18) and (19). The joint plate (21) has a bent portion (47) engaged with the right closing member (19) and the second member (17), and an engaging claw (48) engaged with the right closing member (19). In this state, the right closing member (19) is brazed using the brazing material layer of the right closing member (19).

  Thus, the refrigerant inlet / outlet tank (2) is formed, and the refrigerant outlet header (6) is partitioned into upper and lower spaces (6a) (6b) by the shunt resistor plate (29), and these spaces (6a) (6b) communicates with the refrigerant passage holes (31A) and (31B). The refrigerant outlet (38) of the right closing member (19) communicates with the upper space (6a) of the refrigerant outlet header (6).

  As shown in FIG. 3 and FIGS. 5 to 9, the refrigerant turn tank (3) is formed of an aluminum brazing sheet having a brazing filler metal layer on both sides and is connected to all heat exchange tubes (12). First member (50), a second member (51) made of a bare material formed from an extruded aluminum material and covering the lower side of the first member (50), and an aluminum brazing having a brazing material layer on both sides An aluminum closing member (52) (53) that is formed of a sheet and closes both ends of a hollow body made of both members (50) (51), and an aluminum bear that is long in the left-right direction and joined to the connecting portion (10) The material drainage auxiliary plate (54) and the outer surface of the right closing member (52) are brazed to the refrigerant inflow side intermediate header (9) and the refrigerant outflow side intermediate header (11) in the front-rear direction. It is composed of a long aluminum bare material communicating member (55) and a communicating member (55 The refrigerant inflow side intermediate header (9) and the refrigerant outflow side intermediate header (11) are communicated with each other at the right end.

  The refrigerant inflow side intermediate header portion (9) and the refrigerant outflow side intermediate header portion (11) each have a top surface, front and rear side surfaces, and a bottom surface. The top surfaces of both header sections (9) and (11) are horizontal flat surfaces (9a) and (11a) except for the inner and outer portions in the front-rear direction. A first low-order part (9b) (11b) is formed of an inclined surface linearly inclined downward. And the 1st low-order part (9b) (11b) is the front-and-rear both sides | surfaces of a drainage basin (20), and the front-and-rear both sides | surfaces of a drainage basin (20) are spread outward in the front-back direction. It is preferable that the downward inclination angle with respect to the horizontal plane of the first low-order parts (9b) and (11b) is 45 degrees or more. If the front and rear side surfaces of the drainage basin (20), that is, the first low-order portions (9b) and (11b) of both header portions (9) and (11) are spread upward and outward in the front-rear direction, a straight line It is not limited to the one inclined in a shape, and may be curved. Further, in the front-rear direction outer portions of the top surfaces of the header portions (9), (11), a second low-order portion (9c) comprising an inclined surface linearly inclined downward toward the outer side in the front-rear direction with respect to the horizontal plane. ) (11c). It is preferable that the downward inclination angle with respect to the horizontal plane of the second low-order parts (9c) and (11c) is 45 degrees or more. The front and rear direction outer side surfaces of both header portions (9) and (11) are connected to the second lower level portions (9c) and (11c) of the top surface.

  The first member (50) has a first header forming part (56) that forms the upper part of the refrigerant inflow side intermediate header part (9) and a second header that forms the upper part of the refrigerant outflow side intermediate header part (11). And a connecting wall (58) that connects the header forming portions (56) and (57) and forms the connecting portion (10). The first header forming portion (56) is formed of a horizontal flat top wall (56a) and a first inclined wall integrally formed over the entire length of the rear edge of the top wall (56a) and inclined downward toward the rear. 56b), a second inclined wall (56c) formed integrally with the front edge of the top wall (56a) over the entire length and inclined downward toward the front, and a front edge of the second inclined wall (56c) It consists of a hanging wall (56d) integrally formed over the entire length. The second header forming portion (57) includes a horizontal flat top wall (57a) and a first inclined wall (integrally formed over the entire length of the front edge of the top wall (57a) and inclined downward toward the front ( 57b), a second inclined wall (57c) formed integrally with the rear edge of the top wall (57a) and inclined downward toward the rear, and a rear edge of the second inclined wall (57c) A hanging wall (57d) integrally formed over the entire length. The lower edge of the first inclined wall (56b) of the first header forming portion (56) and the lower edge of the first inclined wall (57b) of the second header forming portion (57) are integrated by the connecting wall (58). It is connected to. The lower end surfaces of the hanging walls (56d) and (57d) of the header forming portions (56) and (57) are inclined downward inward in the front-rear direction, and a step portion (69 described later) is formed by an outer portion of the lower end surfaces. ) Is formed. The upper surface of the top wall (56a) of the first header forming portion (56) forms a horizontal flat surface (9a) of the top surface of the refrigerant inflow side intermediate header portion (9), and both inclined walls (56b) (56c) The outer surface forms both lower portions (9b) and (9c), and the outer surface of the hanging wall (56c) forms the upper portion of the front side surface. The top surface of the top wall (57a) of the second header forming portion (57) forms the horizontal flat surface (11a) of the top surface of the refrigerant outflow side intermediate header portion (11), and both inclined walls (57b) (57c) The outer surface forms both lower portions (11b) and (11c), and the outer surface of the hanging wall (57d) forms the upper portion of the rear side surface.

  A plurality of tube insertion holes (59) that are long in the front-rear direction are formed in both header forming portions (56), (57) of the first member (50) at intervals in the left-right direction. The pipe insertion holes (59) of both header forming portions (56) (57) are at the same position in the left-right direction. The connecting portion (10) side end portion of the tube insertion hole (59), that is, the rear end portion of the tube insertion hole (59) of the first header forming portion (56) and the tube insertion hole of the second header forming portion (57) ( 59) are located on the first inclined walls (56b) and (57b), respectively, so that the end of the pipe insertion hole (59) on the connecting part (10) side is located on the side surface of the drainage basin (20). positioned. In addition, the outer end in the front-rear direction of the pipe insertion hole (59), that is, the front end of the pipe insertion hole (59) of the first header forming part (56) and the pipe insertion hole (59) of the second header forming part (57) The rear end portions are located on the second inclined walls (56c) and (57c), respectively, so that the outer end portions in the front-rear direction of the pipe insertion holes (59) are the top surfaces of both header portions (9) and (11). Are located in the second low-order part (9c) (11c).

  The pipe insertion holes (59) of the top walls (56a) (57a) and the inclined walls (56b) (56c) (57b) (57c) of both header forming portions (56) (57) of the first member (50) The left and right side portions are inclined portions (61) inclined downward toward the tube insertion holes (59), and the recesses (62) are formed by the inclined portions (61) on the left and right sides of each tube insertion hole (59). Is formed (see FIG. 10). On the outer surfaces of the second inclined walls (56c) (57c) and the hanging walls (56d) (57d) of both header forming portions (56) (57) of the first member (50), condensed water is supplied to the refrigerant turn tank ( 3) A drainage groove (63) for draining downward is formed continuously to the outer end in the front-rear direction of the pipe insertion hole (59). The bottom of the drainage groove (63) gradually goes downward as it goes away from the pipe insertion hole (59). The second inclined wall (56c) (57c) in the drainage groove (63), that is, the groove bottom of the portion existing in the second low-order part (9c) (11c), is downward toward the outside in the front-rear direction with respect to the horizontal plane. It is inclined linearly. It is preferable that the downward inclination angle with respect to the horizontal surface of the groove bottom of the portion of the drainage groove (63) existing in the second low-order part (9c) (11c) is 45 degrees or more. The lower ends of the portions of the drainage grooves (63) existing on the hanging walls (56d) and (57d) are opened at the lower end surfaces of the hanging walls (56d) and (57d).

  In the connecting wall (58) of the first member (50), a plurality of drainage through holes (64) elongated in the left-right direction are formed at intervals in the left-right direction. In addition, a plurality of fixing through holes (65) are formed in the connecting wall (58) of the first member (50) at intervals in the left-right direction so as to be shifted from the drain through holes (64). Has been.

  The second member (51) has a first header forming part (66) that forms the lower part of the refrigerant inflow side intermediate header part (9) and a second header formation that forms the lower part of the refrigerant outflow side intermediate header part (11). The connecting wall (68) which connects the portion (67) and the header forming portions (66) (67) and is brazed to the connecting wall (58) of the first member (50) to form the connecting portion (10). And more. The first header forming portion (66) includes a vertical front and rear walls (66a), a bottom wall (66b) having a substantially arcuate cross section projecting downward and integrally connecting lower ends of the front and rear walls (66a). It becomes more. The second header forming portion (67) includes a vertical front and rear walls (67a) and a bottom wall (67b) having a substantially arcuate cross section projecting downward to integrally connect lower ends of the front and rear walls (67a). And a horizontal diversion control wall (67c) (diversion control means) for integrally connecting the upper ends of the front and rear walls (67a). The upper end portion of the rear wall (66a) of the first header forming portion (66) and the upper end portion of the front wall (67a) of the second header forming portion (67) are integrally connected by a connecting wall (68). The outer surface of the front wall (66a) of the first header forming part (66) and the outer surface of the rear wall (67a) of the second header forming part (67) are respectively formed on the first header forming part (56) of the first member (50). The outer surface of the hanging wall (56d) and the hanging wall (57d) outer surface of the second header forming portion (57) are located on the inner side in the front-rear direction, whereby the hanging wall (56d) (57d) of the first member (50) And the front and rear walls (66a) and (67a) of the second member (51) are provided with a stepped portion (69), and the outer surfaces of the hanging walls (56d) and (57d) through the stepped portion (69) The entire bottom end of the drainage groove (63) is open to the stepped portion (69) with respect to the outer surfaces of the wall (66a) and the rear wall (67a) in the front-rear direction (see FIG. 3). The outer surface of the upper edge of the front wall (66a) of the first header forming portion (66) and the outer surface of the upper edge of the rear wall (67a) of the second header forming portion (67) are suspended in the drainage groove (63). It is flush with the bottom surface of the portion existing on the walls (56d) and (57d). And the outer surface of the front wall (66a) of the first header forming part (66) forms the lower part of the front side surface of the refrigerant inflow side intermediate header part (9), and the rear wall of the second header forming part (67) ( 67a) The outer surface forms the lower part of the rear side surface of the refrigerant outflow side intermediate header portion (11).

  A plurality of circular coolant passage holes (71) are formed in the left-right direction at the rear side of the center part in the front-rear direction of the flow dividing control wall (67c) of the second header forming portion (67) of the second member (51). It is formed in a penetrating manner with an interval. The spacing between adjacent circular refrigerant passage holes (71) gradually increases as the distance from the right end, that is, the communication portion between the refrigerant inflow side intermediate header portion (9) and the refrigerant outflow side intermediate header portion (11) increases. . The intervals between adjacent circular coolant passage holes (71) may all be equal. In the connecting wall (68) of the second member (51), drainage through holes (72) that are long in the left-right direction are formed at positions corresponding to the drainage through holes (64) of the first member (50). A fixing through hole (73) is formed at a position corresponding to the fixing through hole (65) of one member (50).

  A notch (74) is formed from the upper edge of the drainage auxiliary plate (54) at the portion corresponding to the drainage through holes (64) and (72) of the first and second members (50) and (51). . The width in the left-right direction of the opening of the notch (74) is equal to the length in the left-right direction of the drainage through holes (64) (72). A drainage auxiliary groove (75) extending in the vertical direction on both front and rear surfaces of the drainage auxiliary plate (54) so as to be connected to the lower end of the notch (74) and having a lower end opened to the lower end surface of the drainage auxiliary plate (54) Is formed. Further, at the upper edge of the drainage auxiliary plate (54), the first and second members (50), (51) are protruded upward at positions matching the fixing through holes (65), (73), and both fixing through holes are provided. (65) A projection (76) is formed which is inserted through (73).

  The right closing member (52) includes a front cap (52a) for closing the right end opening of the refrigerant inflow side intermediate header (9) and a rear cap (52b) for closing the right end opening of the refrigerant outflow side intermediate header (11). The front cap (52a) is integrally formed with a left protruding portion (77) that is fitted into the refrigerant inflow side intermediate header (9), and the rear cap (52b ) Includes an upper left protrusion (78) fitted in the space (11A) above the flow dividing control wall (67c) of the refrigerant outflow side intermediate header (11) and the flow dividing control wall (67c). Also, a lower left protrusion (79) that is fitted into the lower space (11B) is integrally formed with a space in the vertical direction. In addition, an engagement claw (81) protruding leftward is formed on each of the arc-shaped portion between the front and rear side edges and the lower edge of the right closing member (52) and the portion of the upper edge near the front and rear ends. Engaging claws (82) projecting to the right are formed at the center in the front-rear direction of both upper and lower edges. On the bottom wall of the left protrusion (77) of the front cap (52a) of the right closing member (52) is formed a refrigerant outlet (83) for allowing the refrigerant to flow out from the refrigerant inflow side intermediate header (9). Refrigerant flow that causes the refrigerant to flow into the bottom wall of the lower left protrusion (79) of the rear cap (52b) into the portion below the flow dividing control wall (67c) of the refrigerant outflow side intermediate header (11). An inlet (84) is formed.

  In the lower part of the peripheral edge of the refrigerant inlet (84) in the lower left protrusion (79) of the rear cap (52b) of the right closing member (52), the inner side of the refrigerant outlet side intermediate header (11) ( A guide portion (80) which is inclined or curved upward (to the left) and is curved here is integrally formed. The guide part (80) guides the refrigerant flowing into the part below the flow dividing control wall (67c) of the refrigerant outflow side intermediate header part (11) to the upper side (the flow dividing control wall (67c) side).

  The left closing member (53) includes a front cap (53a) that closes the left end opening of the refrigerant inflow side intermediate header (9), and a rear cap (53b) that closes the left end opening of the refrigerant outflow side intermediate header (11). The front cap (53a) is integrally formed with a right protrusion (85) that is fitted into the refrigerant inflow side intermediate header (9), and the rear cap (53b) ) Includes an upper right protrusion (86) fitted into the space (11A) above the flow dividing control wall (67c) of the refrigerant outflow side intermediate header (11), and a flow dividing control wall (67c). Also, a lower right protrusion (87) fitted into the lower space (11B) is integrally formed with a space in the vertical direction. In addition, an engaging claw (88) protruding rightward is formed integrally with the arc-shaped portion between the front and rear side edges and the lower edge of the left closing member (53) and the portion of the upper edge near the front and rear ends. ing.

  The communication member (55) is formed by pressing an aluminum bear material, and is a plate having the same shape and size as the right closing member (52) when viewed from the right, and its peripheral portion is It is brazed to the outer surface of the right closing member (52). The communication member (55) is formed with an outward bulging portion (89) so as to pass through the refrigerant outlet (83) and the refrigerant inlet (84) of the right closing member (52). The inside of the outward bulging portion (89) serves as a communication path (91) that allows the through holes (83) and (84) of the right closing member (52) to pass through. In addition, a notch (92) into which the engaging claw (82) of the right closing member (52) is fitted is formed at the center in the front-rear direction on both upper and lower edges of the communication member (55).

  The first and second members (50) and (51) of the refrigerant turn tank (3), the drainage auxiliary plate (54), the closing members (52) and (53), and the communication member (55) are It is brazed like this. That is, the first member (50) and the second member (51) have a connecting through hole (64) (72) between the connecting walls (58) and (68) and a fixing through hole (65) (73). The two header forming portions (56) and (57) have a suspended wall (56d) (57d) lower end, the front wall (66a) of the first header forming portion (66) and the second header forming portion ( 67) The upper end of the rear wall (67a) is engaged, and the protrusion (76) of the drainage auxiliary plate (54) is inserted into the fixing through holes (65) (73) of both members (50) (51). The two members (50) and (51) are temporarily fastened by being caulked, and are brazed to each other using the brazing material layer of the first member (50). The drainage auxiliary plate (54) is brazed to the connecting walls (58) and (68) of both members (50) and (51) using the brazing material layer of the first member (50). Both the closing members (52) and (53) have the protruding portions (77) and (85) of the front caps (52a) and (53a) by the first header forming portions (56) and (66) of both members (50) and (51) In the space to be formed, the upper projecting portions (78) and (86) of the rear caps (52b) and (53b) are formed by the second header forming portions (57) and (67) of both members (50) and (51). The lower protrusions (79) and (87) of the rear caps (52b) and (53b) are provided in the second header forming portions (50) and (51) of the two members (50) and (51) in the portion above the flow dividing control wall (67c). 57) and (67) are respectively fitted into portions below the flow dividing control wall (67c) in the space formed by the space, and the upper engaging claws (81) and (88) are engaged with the first member (50). With the lower engaging claws (81) and (88) engaged with the second member (51), the brazing material layer of each closing member (52) and (53) is used to The first and second members 50 and 51 are brazed. The communication member (55) is engaged with the communication member (55) so that the engagement claw (82) of the right closure member (52) is fitted in the notch (92). ) Is used to braze the right closing member (52).

  Thus, the refrigerant turn tank (3) is formed, and the refrigerant inlet side intermediate header portion (9) is formed by the first header forming portions (56) and (66) of both members (50) and (51). The second header forming portion (57) (67) forms the refrigerant outflow side intermediate header portion (11). The refrigerant outlet side intermediate header (11) is divided into two upper and lower spaces (11A) and (11B) by a flow dividing control wall (67c), and these spaces (11A) and (11B) are circular refrigerant passage holes (71). It is made to communicate by. The upper space (11A) is a first space where the heat exchange pipe (12) faces, and the lower space (11B) is a second space communicating with the refrigerant inflow side intermediate header portion (9). The refrigerant inflow side intermediate header portion (9) and the lower space (11B) of the refrigerant outflow side intermediate header portion (11) are connected to the refrigerant outlet (83) of the front cap (52a) of the right closing member (52). ), The communication path (91) in the outward bulging portion (89) of the communication member (55), and the refrigerant inlet (84) of the rear cap (52b) of the right closing member (52). ing. Further, the connecting portion (10) is formed by the connecting walls (58) and (68) of the members (50) and (51), and the first low-order portion (9b) of the refrigerant inflow side intermediate header portion (9) and the refrigerant outflow. A drainage basin (20) is formed by the first low-order part (11b) and the connecting part (10) of the side intermediate header part (11).

  The heat exchange pipe (12) is made of a bare material formed of an aluminum extruded profile, and has a wide and flat shape in the front-rear direction, and a plurality of refrigerant passages (12a) extending in the length direction are formed in parallel inside the heat exchange pipe (12). ing. The horizontal cross-sectional shape of the outer surface of the front and rear end walls of the heat exchange pipe (12) is an arc shape with the center portion protruding outward (see FIG. 6). The front heat exchange pipe (12) and the rear heat exchange pipe (12) are arranged at the same position in the left-right direction, and the upper end portion of the heat exchange pipe (12) is a refrigerant inlet / outlet tank ( 2) The first member (16) is inserted into the tube insertion hole (23) and brazed to the first member (16) using the brazing material layer of the first member (16). The turn tank (3) is inserted into the tube insertion hole (59) of the first member (50) and brazed to the first member (50) using the brazing material layer of the first member (50). . The front heat exchange pipe (12) communicates with the refrigerant inlet header section (5) and the refrigerant inflow side intermediate header section (9), and the rear heat exchange pipe (12) communicates with the refrigerant outlet header section (6) and It communicates with the refrigerant outflow side intermediate header (11).

  Here, the tube height (h) which is the thickness in the left-right direction of the heat exchange tube (12) is 0.75 to 1.5 mm (see FIG. 10), the tube width which is the width in the front-rear direction is 12 to 18 mm, and the peripheral wall The wall thickness of the partition wall is 0.175 to 0.275 mm, the thickness of the partition wall partitioning the refrigerant passages (12a) is 0.175 to 0.275 mm, the pitch of the partition wall is 0.5 to 3.0 mm, both front and rear walls The curvature radius of the outer surface is preferably 0.35 to 0.75 mm.

  As the heat exchange pipe (12), instead of one made of an aluminum extruded shape, a pipe in which a plurality of refrigerant passages are formed by inserting inner fins into an aluminum electric sewing pipe may be used. . Also, two flat wall forming parts formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides and connected via connecting parts, and the opposite side of the connecting part in each flat wall forming part A side wall forming portion integrally formed in a protruding shape from the side edges of the flat wall forming portion, and a plurality of partition wall forming portions integrally formed in a protruding shape from the two flat wall forming portions at a predetermined interval in the width direction of the flat wall forming portion. It is also possible to use a plate having a partition wall formed by bending a plate with a hairpin shape at the connecting portion, butting the side wall forming portions with each other and brazing each other.

  The corrugated fin (14) is formed in a corrugated shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, the wave crest (14a), the wave bottom (14b) and the wave crest (14a) and the wave bottom (14b). ) Are connected to each other (see FIG. 10), and a plurality of louvers are formed in the connecting portion (14c) side by side in the front-rear direction. The corrugated fin (14) is shared by the front and rear heat exchange pipes (12) constituting the front and rear heat exchange pipe groups (13), and the width in the front-rear direction is equal to the front edge of the front heat exchange pipe (12). The distance from the rear edge of the rear heat exchange pipe (12) is substantially equal. The wave crest (14a) and the wave bottom (14b) of the corrugated fin (14) are brazed to the front and rear heat exchange tubes (12).

  Here, the fin height (H) of the corrugated fin (14) is a linear distance between the wave crest (14a) and the wave bottom (14b), and the fin height (H) is 7.0 mm to 10.0 mm. Preferably there is. Further, the fin pitch (Pf) of the corrugated fin (14) is 1/2 of the interval (P) between the central portions in the vertical direction of the adjacent wave crest (14a) or wave bottom (14b), that is, Pf = P / 2. It is preferable that the fin pitch (Pf) is 1.3 to 1.7 mm. The corrugated fin (14) has a wave crest (14a) and a wave bottom (14b) that are flatly brazed to the heat exchange pipe (12) in a surface contact manner, and provided on both sides of the flat part and connected to each other. The radius of curvature (R) of the rounded portion is preferably 0.7 mm or less (see FIG. 10).

  The evaporator (1) is manufactured by temporarily fixing a combination of the constituent members excluding the refrigerant inlet pipe (7) and the refrigerant outlet pipe (8), and brazing all the constituent members together.

  The evaporator (1) constitutes a refrigeration cycle together with a compressor and a condenser as a refrigerant cooler, and is mounted on a vehicle, for example, an automobile, as a car air conditioner.

  In the evaporator (1) described above, as shown in FIG. 11, the gas-liquid mixed phase two-phase refrigerant that has passed through the compressor, the condenser, and the expansion valve flows from the refrigerant inlet pipe (7) to the refrigerant inlet of the joint plate (21). (45) and through the refrigerant inlet (37) of the front cap (19a) of the right closing member (19) into the refrigerant inlet header part (5) of the refrigerant inlet / outlet tank (2) and divert to the front heat exchange. It flows into the refrigerant passage (12a) of the heat exchange pipe (12) of the pipe group (13).

  The refrigerant flowing into the refrigerant passage (12a) of the heat exchange pipe (12) flows downward in the refrigerant passage (12a) and enters the refrigerant inflow-side intermediate header (9) of the refrigerant turn tank (3). . The refrigerant that has entered the refrigerant inflow side intermediate header (9) flows to the right, the refrigerant outlet (83) of the front cap (52a) of the right closing member (52), and the outward expansion of the communication member (55). The lower space of the refrigerant outflow side intermediate header section (11) is turned to change the flow direction by passing through the communication path (91) in the section (89) and the refrigerant inlet (84) of the rear cap (52b). Enter (11B). Here, due to the fact that the refrigerant flow from the refrigerant inlet header (5) to the front heat exchange pipe (12) is not sufficiently uniform, the refrigerant flowing through the front heat exchange pipe (12) Even if the temperature (refrigerant dryness) distribution is uneven, when turning into the lower space (11B) of the refrigerant inflow side intermediate header part (11) from the refrigerant inflow side intermediate header part (9) As a result, the temperature of the refrigerant becomes uniform.

  The refrigerant that has entered the lower space (11B) of the refrigerant outflow side intermediate header (11) flows to the left, passes through the circular refrigerant passage hole (71) of the flow dividing control wall (67c), and enters the upper space (11A). It enters, divides, and flows into the refrigerant passages (12a) of all the rear heat exchange tubes (12). At this time, the refrigerant is guided by the guide portion (80) and flows to the left side of the diversion control wall (67c) obliquely upward left, that is, inward of the lower space (11B) (see arrows Y in FIGS. 2 and 8). As a result, the interval between the adjacent circular refrigerant passage holes (71) formed in the flow dividing control wall (67c) gradually increases as the distance from the right end portion increases. The distribution in the left-right direction of the refrigerant flowing into the upper space (11A) through (71) is made uniform as compared with the case where there is no guide part (80). Therefore, the refrigerant is likely to be evenly divided into the heat exchange pipe (12) connected to the refrigerant outflow side intermediate header (11), and the distribution of the refrigerant in the heat exchange core (4) is less likely to occur. The temperature of the air passing through the heat exchange core part (4) is also made uniform, and the heat exchange performance is improved.

  The refrigerant flowing into the refrigerant passage (12a) of the heat exchange pipe (12) changes the flow direction and flows upward in the refrigerant passage (12a) to enter the lower space (6b) of the refrigerant outlet header (6). And enters the upper space (6a) through the oblong refrigerant passage holes (31A) and (31B) of the shunt resistor plate (29). Here, since resistance is given to the flow of the refrigerant by the shunt resistor plate (29), the shunt flows from the upper space (11A) of the refrigerant outflow side intermediate header (11) to the rear heat exchange pipe (12). Are made uniform, and the flow from the refrigerant inlet header (5) to the front heat exchange pipe (12) is made more uniform. As a result, the refrigerant circulation amount of all the heat exchange tubes (12) is made uniform, and the temperature distribution of the entire heat exchange core part (4) is made uniform.

  Next, the refrigerant that has entered the upper space (6a) of the refrigerant outlet header (6) flows into the refrigerant outlet (38) of the rear cap (19b) of the right closing member (19) and the refrigerant outlet of the joint plate (21). It passes through (46) and flows out to the refrigerant outlet pipe (8). While the refrigerant flows through the refrigerant passage (12a) of the front heat exchange pipe (12) and the refrigerant passage (12a) of the rear heat exchange pipe (12), the ventilation gap is indicated by an arrow in FIGS. It exchanges heat with the air flowing in the direction indicated by X and flows out as a gas phase.

  At this time, a large amount of condensed water is generated on the surfaces of the heat exchange pipe (12) and the corrugated fin (14), particularly on the surface of the corrugated fin (14). Most of the generated condensed water flows to the junction side between the wave exchange part (14a) and the wave bottom part (14b) of the heat exchange pipe (12) and the corrugated fin (14) by the capillary effect. The condensed water drawn to the joint between the rear heat exchange pipe (12) and the corrugated fin (14) is moved forward by the wind flowing through the ventilation gap between the heat exchange pipes (12) adjacent in the left-right direction. It flows and drains downward along the front end face of the rear heat exchange pipe (12). In addition, the condensed water drawn to the junction between the front heat exchange pipe (12) and the corrugated fin (14) is caused by the wind flowing through the ventilation gap between the heat exchange pipes (12) adjacent in the left-right direction. And is drained downward along the front end face of the front heat exchange pipe (12).

  Condensed water drained downward along the front end face of the rear heat exchange pipe (12) enters the drainage basin (20) of the refrigerant turn tank (3) and condensates to some extent in the drainage basin (20). When it accumulates, it flows out through the drainage through holes (64) and (72) to the lower part of the connecting part (10) and flows along the peripheral edge of the notch (74) of the drainage auxiliary plate (54) to assist drainage. It enters into the groove (75), flows downward in the drainage auxiliary groove (75), and falls from the lower end opening to the lower side of the refrigerant turn tank (3). Condensed water drained downward along the front end face of the front heat exchange pipe (12) enters the drainage groove (63) and flows through the drainage groove (63), that is, its lower end opening, that is, the step part (69). Falls from the opening to the bottom of the refrigerant turn tank (3). Thus, the generated condensed water is drained.

In the above embodiment, the evaporator according to the present invention is applied to an evaporator of a car air conditioner using a chlorofluorocarbon refrigerant. However, the invention is not limited to this. In a vehicle having a car air conditioner having a exchanger, an expansion valve and an evaporator and using a supercritical refrigerant such as a CO ₂ refrigerant, for example, an automobile, it may be applied to an evaporator of a car air conditioner.

  Further, in the above embodiment, between the refrigerant inlet header portion (5) and the refrigerant inflow side intermediate header portion (9) of both tanks (2) and (3), and between the refrigerant outlet header portion (6) and the refrigerant outflow side. One heat exchange tube group (13) is provided between each of the intermediate header portions (11). However, the present invention is not limited to this, and the refrigerant inlet header portions (5) of both tanks (2) (3) are provided. There are one or more heat exchange pipe groups (13) between the refrigerant inlet side intermediate header (9) and between the refrigerant outlet header (6) and the refrigerant outlet intermediate header (11). It may be provided. Furthermore, in the above embodiment, the refrigerant inlet / outlet tank (2) is on the upper side and the refrigerant turn tank (3) is on the lower side. It may be used with the turn tank (3) on top.

  In the above embodiment, the evaporator (1) includes the refrigerant inlet header (5), the refrigerant outlet header (6), the refrigerant inflow intermediate header (9), and the refrigerant outflow intermediate header (11). However, instead of this, a refrigerant inlet that is arranged on the upper end side of the heat exchange pipe and to which the heat exchange pipe in the left half of the front heat exchange pipe group is connected, like the evaporator described in Patent Document 1. A header part, a refrigerant outlet header part arranged on the rear side of the refrigerant inlet header part on the upper end side of the heat exchange pipe, and connected to the left half heat exchange pipe of the rear heat exchange pipe group, and a heat exchange pipe A first intermediate header part to which a heat exchange pipe of a heat exchange pipe group connected to the refrigerant inlet header part is connected, and a right side of the first intermediate header part, and the front heat The second intermediate header part to which the remaining heat exchange tubes of the exchange tube group are connected, and the upper end side of the heat exchange tubes A third intermediate header portion disposed on the right side of the refrigerant inlet header portion and connected to a heat exchange pipe connected to the second intermediate header portion; and a third intermediate header portion on an upper end side of the heat exchange pipe. A fourth intermediate header portion disposed on the rear side and connected to the remaining heat exchange tubes of the rear heat exchange tube group, and disposed on the rear side of the second intermediate header portion on the lower end side of the heat exchange tubes; and A fifth intermediate header portion to which a heat exchange pipe connected to the fourth intermediate header portion is connected, and is arranged on the left side of the fifth intermediate header portion on the lower end side of the heat exchange pipe and connected to the refrigerant outlet header portion. And a sixth intermediate header portion connected to the heat exchange pipe, and the refrigerant flowing into the refrigerant inlet header portion passes through the heat exchange pipe and passes through the first to sixth intermediate header portions in the refrigerant outlet header portion. To flow out of the header of the refrigerant outlet. It may be. In such an evaporator, the guide portion that guides the refrigerant flowing into the second and sixth intermediate header portions upward is provided at the refrigerant inflow side end portion of the second and sixth intermediate header portions. In the evaporator, the third intermediate header portion and the fourth intermediate header portion may be communicated with each other at the end opposite to the refrigerant inlet header portion and the refrigerant outlet header portion. In this case, since the refrigerant flows from one end of the fourth intermediate header portion, a guide portion for guiding the flowing refrigerant upward is provided at the refrigerant inflow side end portion of the fourth intermediate header portion.

  Furthermore, in the said embodiment, although the heat exchanger by this invention is applied to the evaporator, it is not limited to this.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which a heat exchanger according to the present invention is applied. It is the vertical sectional view which omitted the middle part at the time of seeing the evaporator shown in Drawing 1 from back. It is the AA line expanded sectional view of Drawing 2 which omitted some. It is a disassembled perspective view of the refrigerant | coolant inlet / outlet part of the evaporator shown in FIG. It is a disassembled perspective view of the part of the tank for refrigerant | coolant turns of the evaporator shown in FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is an expansion perspective view which shows the right side closing member and communication member of a tank for refrigerant | coolant turns. FIG. 3 is a partially enlarged view of FIG. 2. It is CC sectional view taken on the line of FIG. FIG. 4 is an enlarged sectional view taken along line DD of FIG. 3. It is a figure which shows how the refrigerant | coolant flows in the evaporator shown in FIG.

Explanation of symbols

(1): Evaporator (heat exchanger)
(4): Heat exchange core
(5): Refrigerant inlet header
(6): Refrigerant outlet header
(9): Refrigerant inflow side intermediate header (first intermediate header)
(11): Refrigerant outflow side intermediate header (second intermediate header)
(11A): Upper space (first space)
(11B): Lower space (second space)
(12): Heat exchange pipe
(13): Heat exchange tube group
(14): Corrugated fin
(14a): Wave peak
(14b): Wave bottom
(14c): Connection part
(29): Resistive plate for shunting (compartment means)
(37): Refrigerant inlet
(38): Refrigerant outlet
(50): First member
(51): Second member
(52) (53): Closing member
(52a) (53a): Front cap
(52b) (53b): Rear cap
(55): Communication member
(67c) ： Diversion control wall (diversion control means)
(71): Refrigerant passage hole
(80): Guide section
(83): Refrigerant outlet
(84): Refrigerant inlet

Claims (21)

A refrigerant inlet header section and a refrigerant outlet header section arranged side by side in the front-rear direction, and a refrigerant circulation path through which both header sections pass, the refrigerant circulation path comprising a plurality of intermediate header sections and a plurality of heat exchange tubes The refrigerant inlet header portion and one intermediate header portion are opposed to each other, and the refrigerant outlet header portion and the other intermediate header portion are opposed to each other between the refrigerant inlet header portion and the intermediate header portion. In addition, at least one row of heat exchange pipe groups including a plurality of heat exchange pipes arranged at intervals is provided between the refrigerant outlet header part and the intermediate header part to constitute these heat exchange pipe groups. Both end portions of the heat exchange pipe are connected to the header portions facing each other, and the refrigerant flowing into the refrigerant inlet header portion returns to the refrigerant outlet header portion through the refrigerant circulation path, from the refrigerant outlet header portion. Ri and together are adapted to be served, at least one of the intermediate header section, a heat exchanger refrigerant from one end of the length direction is adapted to flow,
A heat exchanger in which a guide portion that guides the refrigerant flowing into the intermediate header portion upward is provided at an end portion of the refrigerant inflow side in the intermediate header portion into which the refrigerant flows from one end portion in the lengthwise direction. A heat exchange core group configured by arranging a plurality of rows of heat exchange tubes arranged in the front-rear direction and a plurality of heat exchange tubes arranged at intervals, and arranged on one end side of the heat exchange tube, And the refrigerant | coolant inlet header part to which the heat exchange pipe | tube of the heat exchange pipe group of at least 1 row was connected, and it arrange | positioned in the rear side of a refrigerant | coolant inlet header part in the one end side of a heat exchange pipe, and the heat of the remaining heat exchange pipe | tube groups. A refrigerant outlet header part to which the exchange pipe is connected, a first intermediate header part arranged on the other end side of the heat exchange pipe and connected to the refrigerant inlet header part, and a heat exchange pipe A second intermediate header portion disposed on the rear side of the first intermediate header portion and connected to the refrigerant outlet header portion on the other end side of the first intermediate header portion. And the second intermediate header portion communicate with each other at one end, The refrigerant flows into the header portion from the end portion on the communication side with the first intermediate header portion, and the refrigerant flowing into the second intermediate header portion is directed upward at the refrigerant inflow side end portion of the second intermediate header portion. The heat exchanger according to claim 1, wherein a guide portion for guiding is provided. The second intermediate header portion is provided with a flow dividing control means that has a refrigerant passage hole and divides the inside of the second intermediate header portion into two spaces in the height direction, and is connected to the second intermediate header portion. The pipe faces the first space, and the first intermediate header portion and the second space of the second intermediate header portion are communicated at one end portion, and are provided at the refrigerant inflow side end portion in the second intermediate header portion. The heat exchanger according to claim 2, wherein the guide portion guides the refrigerant flowing into the second space of the second intermediate header portion upward. The heat exchanger according to claim 3, wherein a plurality of refrigerant passage holes are formed in the diversion control means at intervals in the length direction of the second intermediate header portion. The heat exchanger according to claim 3 or 4, wherein the refrigerant passage hole is formed on the rear side of the center portion in the front-rear direction of the flow dividing control means. The refrigerant inlet header part and the refrigerant outlet header part are arranged on the upper end side of the heat exchange pipe, and the first and second intermediate header parts are arranged on the lower end side of the heat exchange pipe. The heat exchanger as described in. Each of the first and second intermediate header portions has a cap that closes the opening at both ends, a refrigerant outlet is formed in the cap at one end portion of the first intermediate header portion, and one end of the second intermediate header portion. The refrigerant inlet is formed in the cap of the portion, and the intermediate outlet is communicated at one end by allowing the refrigerant outlet and the refrigerant inlet to communicate with each other through the communication member. The heat exchanger in any one of. The heat exchange according to claim 7, wherein a guide portion that is inclined or curved upward toward the inside of the second intermediate header portion is provided in a part of the peripheral edge portion of the refrigerant inlet in the cap at one end portion of the second intermediate header portion. vessel. The guide portion is curved upward toward the inside of the second intermediate header portion, and the guide portion is inward of the second intermediate header portion in a cross section cut by a vertical plane extending in the length direction of the second intermediate header portion. The heat exchanger according to claim 8, wherein the heat exchanger has an arcuate portion curved upward. The cap formed with the refrigerant inlet in the first intermediate header and the cap formed with the refrigerant outlet in the second intermediate header are integrated, and the communication member is fixed so as to straddle both caps. The heat exchanger according to any one of claims 7 to 9. The heat exchanger according to any one of claims 2 to 10, wherein the first intermediate header portion and the second intermediate header portion are integrated. The 1st and 2nd intermediate header part forms the part by the side of the heat exchange pipe of both the intermediate header parts, and the heat exchange pipe is connected to the first member, and the part opposite to the heat exchange pipe of the both intermediate header parts And a second member joined to the first member, whereby both intermediate header portions are integrated. The heat exchanger according to any one of claims 2 to 12, wherein the refrigerant inlet header portion and the refrigerant outlet header portion are integrated. The refrigerant inlet header part and the refrigerant outlet header part form a part on the heat exchange pipe side of both header parts and the heat exchange pipes are connected to the first member, and the parts opposite to the heat exchange pipes of both header parts. The heat exchanger according to claim 13, further comprising: a second member formed and joined to the first member, whereby both header portions are integrated. The heat exchange according to any one of claims 2 to 14, wherein a refrigerant inlet is formed at one end of the refrigerant inlet header, and a refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header. vessel. The refrigerant outlet header is partitioned into two spaces in the height direction by the partitioning means, and a heat exchange pipe is connected so as to face the first space, a refrigerant passage hole is formed in the partitioning means, and the refrigerant outlet header part The heat exchanger according to claim 15, wherein the second space communicates with the refrigerant outlet. The heat exchange pipe is flat, and is arranged with its width direction facing the front-rear direction, and the pipe height, which is the thickness of the heat exchange pipe, is 0.75 to 1.5 mm. A heat exchanger according to any of the above. Fins are arranged between adjacent heat exchange tubes, and the fins have a corrugated shape including a wave crest part, a wave bottom part, and a flat connection part that connects the wave crest part and the wave bottom part, and the fin height is 7. The heat exchanger according to any one of claims 1 to 17, wherein 0 mm to 10.0 mm and a fin pitch are 1.3 to 1.7 mm. 19. The corrugated fin has a wave crest and a wave bottom formed of a flat portion and a rounded portion provided on both sides of the flat portion and connected to the connecting portion, and the radius of curvature of the rounded portion is 0.7 mm or less. The described heat exchanger. A refrigeration cycle comprising a compressor, a refrigerant cooler, and an evaporator, wherein the evaporator comprises the heat exchanger according to any one of claims 1 to 19. A vehicle in which the refrigeration cycle according to claim 20 is mounted as an air conditioner.

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